linux-kernel - Re: [PATCH 3/9] x86/moorestown: add moorestown platform flags

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Date:	Fri, 26 Jun 2009 17:00:51 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	"Pan, Jacob jun" <jacob.jun.pan@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 3/9] x86/moorestown: add moorestown platform flags

* Ingo Molnar <mingo@...e.hu> wrote:

> And? There's an obvious quality difference between various 
> platform enumeration methods - and we strive for the highest 
> quality methods.
> 
> Using boot flags is one of the lowest quality enumeration methods 
> and the fact that there's precedence for it in other architectures 
> is not a technical reason to make the same mistakes on x86 too.
> 
> Especially here where there's two other enumeration methods easily 
> available: SFI and PCI. Any of those suffices.

btw., the "I am MRST" bootstrap info is certainly doable via a 
bootloader flag as well, if this platform is _so_ deprived of basic 
PC features that it has no other channel of information. Especially 
if it has no BIOS and if the bootloader provides the memory map as 
well - which seems to be the case here.

I can understand the PCI ID space being potentially awkward (if many 
models with mismatching PCI IDs are planned) - so it's certainly 
possible that the only thing that remains in the end is the 
bootloader provided flag - no matter how sucky that may be.

So i am not trying to make a bigger deal out of this than it really 
deserves and this is not a showstopper in my eyes - but this is 
really an exceptional case and shouldnt be the glory model for how 
ultra embedded should be done on x86 ...

	Ingo
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